This ongoing series explores significant developments on the internet, like this new hot thing called twitter that everyone's been talking about. We've culled the, uh, "twitterverse" to bring you some of the more curious and unique accounts out there (plus a few entertaining twitter spin-offs). Feel free to add links or suggestions in the comments section.

Twitter feed created using the "Tweeting RFID Cat Door". Description from the site Tweeting Cat Door:

Each cat has a small RFID tag on the collar. When a cat is in the close proximity of the door, a small RFID reader reads the tag and if the cat is authorized, a servo will unlock the cat door. The RFID reader and the servo controller are connected to an old laptop. The software on the laptop is written in Delphi and for each "cat door event" is sending a Twitter message and a picture to twitter.com.

Twitter feed of injuries by Petra Cortright.

The unofficial Denton Mugshot twitter for Denton, Texas. Programmed by a UNT art photography student, drawing attention to how much public info we put online.

The Twittering office chair "tweets" (posts a Twitter update) upon the detection of natural gas such as that produced by human flatulence.

The twitter feed from "On Kawara"

Faces made with unicode

Documentation of documentation from vvork (not affiliated with vvork.com), started by Guthrie Lonergan, managed by Tom Moody.

General Web Content is an ongoing series that spotlights developments on the internet which bear on aesthetic and/or cultural concerns. In this edition, we turn to eBay blogs. The authors here assemble eBay listings in their posts according to an overarching idea, theme or sensibility. If you have an eBay blog you would like to share, please post links in the comments section.

About Sentimental Value:I’ve always had a love for vintage objects and a curiosity about their former lives. Sentimental Value collects some of the more noteworthy stories about clothing and accessories I’ve discovered while digging through Ebay.